bad ass

基本解释

The ultimate leader, the ultimate boy scout, the ultimate bad ass.
終極領袖，終極的童子軍，終極的大牛。
I wouldn’t be surprised if I outperformed bloggers with much larger (but not as bad ass!) fan bases than mine.
如果不是我勝過了擁有比我更大粉絲團的博友，我不會如此驚訝。
So resist the temptation to talk about the "bad ass" paper you need help with, your "loser" TA who didn't teach you what you needed to know, or the "cruddy" grade you just got on the midterm.
不談論你需要幫助的“爛尾”論文，你那不教你需要知道的知識的“失敗”助教，或者在期中你剛得的“糟糕”成勣。

However, if you want to complain about every bad ass prosecutor out there, you would probably have a pretty long list of names.
FORBES: There Are No Nice Prosecutors When You Are A Defendant
This year Hollywood is ending the year with a vengeance amidst the remake of the 1969 classic, TRUE GRIT, which starred the original Hollywood bad ass, John Wayne .
FORBES: True Grit - Investing With A Vengeance
When we saw the Corsair 900D at CES we knew we had the enclosure we needed to make the original Hailstorm look like a small mid-tower system and not the bad ass high performance system it really was.
ENGADGET: Digital Storm's Hailstorm II relieves you of gaming PC claustrophobia, $2,760 cash

If you describe someone as a badass, you mean that they are very tough or violent.
Badass is also an adjective.
Some people use badass to describe something they think is very good or impressive.